product upgrade 
Product enjoys free software upgrade service during service period
Product installation
Professional engineer guides installation on site
Product configuration
You can get configuration guidance service through remote control, telephone, on-site service
Product Maintenance 
You can use the remote control, telephone, on-site service for fault analysis, troubleshooting, etc.
Product Inspection
You can get inspection service through remote control, telephone, on-site service
Product training
You can get product training service through remote control, telephone, on-site service, or visit our website for the latest training materials